
        <div class="row">
          <div class="col-md-12">
            <div class="card card-primary card-outline">
              <div class="card-header">
                <h3 class="card-title">
                  <i class="fas fa-edit"></i>
按钮
                </h3>
              </div>
              <div class="card-body pad table-responsive">
                <p>各种类型的按钮。使用基类 <code>.btn</code></p>
                <table class="table table-bordered text-center">
                  <tr>
                    <th>标准</th>
                    <th>大 <code>.btn-lg</code></th>
                    <th>小 <code>.btn-sm</code></th>
                    <th>很小 <code>.btn-xs</code></th>
                    <th>扁平化 <code>.btn-flat</code></th>
                    <th>禁用 <code>.disabled</code></th>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-default">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-lg">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-sm">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-xs">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default btn-flat">默认</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-default disabled">默认</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-primary">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-lg">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-sm">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-xs">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary btn-flat">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-primary disabled">主要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-lg">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-sm">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-xs">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary btn-flat">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-secondary disabled">次要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-success">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-lg">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-sm">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-xs">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success btn-flat">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-success disabled">成功</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-info">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-lg">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-sm">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-xs">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info btn-flat">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-info disabled">信息</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-danger">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-lg">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-sm">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-xs">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger btn-flat">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-danger disabled">危险</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-warning">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-lg">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-sm">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-xs">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning btn-flat">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-warning disabled">警告</button>
                    </td>
                  </tr>
                </table>
              </div>
              <!-- /.card -->
            </div>
          </div>
          <!-- /.col -->
        </div>
        <!-- ./row -->

        <div class="row">
          <div class="col-md-12">
            <div class="card card-primary card-outline">
              <div class="card-header">
                <h3 class="card-title">
                  <i class="fas fa-edit"></i>
                  按钮外形
                </h3>
              </div>
              <div class="card-body pad table-responsive">
                <p>各种类型的按钮。使用基类 <code>.btn</code></p>
                <table class="table table-bordered text-center">
                  <tr>
                    <th>标准</th>
                    <th>大 <code>.btn-lg</code></th>
                    <th>小 <code>.btn-sm</code></th>
                    <th>很小 <code>.btn-xs</code></th>
                    <th>扁平化 <code>.btn-flat</code></th>
                    <th>禁用 <code>.disabled</code></th>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-lg">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-sm">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-xs">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary btn-flat">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-primary disabled">主要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-lg">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-sm">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-xs">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary btn-flat">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-secondary disabled">次要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-lg">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-sm">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-xs">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success btn-flat">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-success disabled">成功</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-lg">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-sm">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-xs">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info btn-flat">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-info disabled">信息</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-lg">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-sm">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-xs">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger btn-flat">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-danger disabled">危险</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-lg">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-sm">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-xs">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning btn-flat">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block btn-outline-warning disabled">警告</button>
                    </td>
                  </tr>
                </table>
              </div>
              <!-- /.card -->
            </div>
          </div>
          <!-- /.col -->
        </div>
        <!-- ./row -->

        <div class="row">
          <div class="col-md-12">
            <div class="card card-primary card-outline">
              <div class="card-header">
                <h3 class="card-title">
                  <i class="fas fa-edit"></i>
                  渐变按钮 (bg-gradient-*)
                </h3>
              </div>
              <div class="card-body pad table-responsive">
                <p>各种类型的按钮。使用基类 <code>.btn</code></p>
                <table class="table table-bordered text-center">
                  <tr>
                    <th>标准</th>
                    <th>大 <code>.btn-lg</code></th>
                    <th>小 <code>.btn-sm</code></th>
                    <th>很小 <code>.btn-xs</code></th>
                    <th>扁平化 <code>.btn-flat</code></th>
                    <th>禁用 <code>.disabled</code></th>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-lg">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-sm">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-xs">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary btn-flat">主要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-primary disabled">主要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-lg">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-sm">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-xs">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary btn-flat">次要</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-secondary disabled">次要</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-lg">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-sm">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-xs">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success btn-flat">成功</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-success disabled">成功</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-lg">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-sm">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-xs">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info btn-flat">信息</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-info disabled">信息</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-lg">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-sm">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-xs">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger btn-flat">危险</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-danger disabled">危险</button>
                    </td>
                  </tr>
                  <tr>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-lg">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-sm">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-xs">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning btn-flat">警告</button>
                    </td>
                    <td>
                      <button type="button" class="btn btn-block bg-gradient-warning disabled">警告</button>
                    </td>
                  </tr>
                </table>
              </div>
              <!-- /.card -->
            </div>
          </div>
          <!-- /.col -->
        </div>
          <!-- ./row -->
        <div class="row">
          <div class="col-md-6">
            <!-- Block buttons -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">块按钮</h3>
              </div>
              <div class="card-body">
                <button type="button" class="btn btn-default btn-block">.btn-block</button>
                <button type="button" class="btn btn-default btn-block btn-flat">.btn-block .btn-flat</button>
                <button type="button" class="btn btn-default btn-block btn-sm">.btn-block .btn-sm</button>
              </div>
            </div>
            <!-- /.card -->

            <!-- Horizontal grouping -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">水平按钮组</h3>
              </div>
              <div class="card-body table-responsive pad">
                <p>
                  水平按钮组很容易创建，
                  你只需要在 <code>&lt;div class="btn-group"&gt;&lt;/div&gt;</code> 添加按钮
                </p>

                <table class="table table-bordered">
                  <tr>
                    <th>按钮</th>
                    <th>图标</th>
                    <th>扁平化</th>
                    <th>下拉</th>
                  </tr>
                  <!-- Default -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default">左边</button>
                        <button type="button" class="btn btn-default">中间</button>
                        <button type="button" class="btn btn-default">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-default">1</button>
                        <button type="button" class="btn btn-default">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-default dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- ./default -->
                  <!-- Info -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info">左边</button>
                        <button type="button" class="btn btn-info">中间</button>
                        <button type="button" class="btn btn-info">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-info">1</button>
                        <button type="button" class="btn btn-info">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-info dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /. info -->
                  <!-- /.danger -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger">左边</button>
                        <button type="button" class="btn btn-danger">中间</button>
                        <button type="button" class="btn btn-danger">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-danger">1</button>
                        <button type="button" class="btn btn-danger">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-danger dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.danger -->
                  <!-- warning -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning">左边</button>
                        <button type="button" class="btn btn-warning">中间</button>
                        <button type="button" class="btn btn-warning">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-warning">1</button>
                        <button type="button" class="btn btn-warning">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-warning dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.warning -->
                  <!-- success -->
                  <tr>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success">左边</button>
                        <button type="button" class="btn btn-success">中间</button>
                        <button type="button" class="btn btn-success">右边</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group">
                        <button type="button" class="btn btn-success">1</button>
                        <button type="button" class="btn btn-success">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-success dropdown-toggle dropdown-icon" data-toggle="dropdown">
                          </button>
                          <div class="dropdown-menu">
                            <a class="dropdown-item" href="#">下拉链接</a>
                            <a class="dropdown-item" href="#">下拉链接</a>
                          </div>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.success -->
                </table>
              </div>
            </div>
            <!-- /.card -->

            <div class="card">
              <div class="card-header">
                <h3 class="card-title">附加按钮</h3>
              </div>
              <div class="card-body">
                <strong>使用下拉</strong>
                <div class="input-group mb-3">
                  <div class="input-group-prepend">
                    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
操作
                    </button>
                    <div class="dropdown-menu">
                      <a class="dropdown-item" href="#">操作</a>
                      <a class="dropdown-item" href="#">另一个操作</a>
                      <a class="dropdown-item" href="#">其他</a>
                      <div class="dropdown-divider"></div>
                      <a class="dropdown-item" href="#">分隔符</a>
                    </div>
                  </div>
                  <!-- /btn-group -->
                  <input type="text" class="form-control">
                </div>
                <!-- /input-group -->
                <strong>正常</strong>
                <div class="input-group mb-3">
                  <div class="input-group-prepend">
                    <button type="button" class="btn btn-danger">操作</button>
                  </div>
                  <!-- /btn-group -->
                  <input type="text" class="form-control">
                </div>
                <!-- /input-group -->
                <strong>扁平化</strong>
                <div class="input-group mb-3">
                  <input type="text" class="form-control rounded-0">
                  <span class="input-group-append">
                    <button type="button" class="btn btn-info btn-flat">执行！</button>
                  </span>
                </div>
                <!-- /input-group -->
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->
            <!-- split buttons box -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">分割按钮</h3>
              </div>
              <div class="card-body">
                <!-- Split button -->
                <p class="mb-1">正常分割按钮：</p>

                <div class="margin">
                  <div class="btn-group">
                    <button type="button" class="btn btn-default">操作</button>
                    <button type="button" class="btn btn-default dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-info">操作</button>
                    <button type="button" class="btn btn-info dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-danger">操作</button>
                    <button type="button" class="btn btn-danger dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-success">操作</button>
                    <button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-warning">操作</button>
                    <button type="button" class="btn btn-warning dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                </div>

                <!-- flat split buttons -->
                <p class="mt-3 mb-1">扁平化分割按钮：</p>

                <div class="margin">
                  <div class="btn-group">
                    <button type="button" class="btn btn-default btn-flat">操作</button>
                    <button type="button" class="btn btn-default btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-info btn-flat">操作</button>
                    <button type="button" class="btn btn-info btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-danger btn-flat">操作</button>
                    <button type="button" class="btn btn-danger btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-success btn-flat">操作</button>
                    <button type="button" class="btn btn-success btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-warning btn-flat">操作</button>
                    <button type="button" class="btn btn-warning btn-flat dropdown-toggle dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                </div>

                <!-- Split button -->
                <p class="mt-3 mb-1">水平分割按钮：</p>
                <div class="margin">
                  <div class="btn-group">
                    <button type="button" class="btn btn-default">操作</button>
                    <button type="button" class="btn btn-default dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </div>
                    </button>
                  <div class="btn-group">
                    <button type="button" class="btn btn-info">操作</button>
                    <button type="button" class="btn btn-info dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-danger">操作</button>
                    <button type="button" class="btn btn-danger dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-success">操作</button>
                    <button type="button" class="btn btn-success dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                  <div class="btn-group">
                    <button type="button" class="btn btn-warning">操作</button>
                    <button type="button" class="btn btn-warning dropdown-toggle dropdown-hover dropdown-icon" data-toggle="dropdown">
                      <span class="sr-only">下拉切换</span>
                      <div class="dropdown-menu" role="menu">
                        <a class="dropdown-item" href="#">操作</a>
                        <a class="dropdown-item" href="#">另一个操作</a>
                        <a class="dropdown-item" href="#">其他</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">分隔符</a>
                      </div>
                    </button>
                  </div>
                </div>


              </div>
              <!-- /.card-body -->
            </div>
            <!-- end split buttons box -->
          </div>
          <!-- /.col -->
          <div class="col-md-6">
            <!-- Application buttons -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">应用程序按钮</h3>
              </div>
              <div class="card-body">
                <p>添加 <code>.btn.btn-app</code> 类到 <code>&lt;a></code> 标签中实现：</p>
                <a class="btn btn-app">
                  <i class="fas fa-edit"></i> 编辑
                </a>
                <a class="btn btn-app">
                  <i class="fas fa-play"></i> 播放
                </a>
                <a class="btn btn-app">
                  <i class="fas fa-pause"></i> 暂停
                </a>
                <a class="btn btn-app">
                  <i class="fas fa-save"></i> 保存
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-warning">3</span>
                  <i class="fas fa-bullhorn"></i> 通知
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-success">300</span>
                  <i class="fas fa-barcode"></i> 产品
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-purple">891</span>
                  <i class="fas fa-users"></i> 用户
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-teal">67</span>
                  <i class="fas fa-inbox"></i> 订单
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-info">12</span>
                  <i class="fas fa-envelope"></i> 收件箱
                </a>
                <a class="btn btn-app">
                  <span class="badge bg-danger">531</span>
                  <i class="fas fa-heart"></i> 喜欢
                </a>
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->

            <!-- Vertical grouping -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">垂直按钮组</h3>
              </div>
              <div class="card-body table-responsive pad">

                <p>
                  垂直按钮组很容易创建，
                  你只需要将按钮添加到 <code>&lt;div class="btn-group-vertical"&gt;&lt;/div&gt;</code>
                </p>

                <table class="table table-bordered">
                  <tr>
                    <th>按钮</th>
                    <th>图标</th>
                    <th>扁平化</th>
                    <th>下拉</th>
                  </tr>
                  <!-- Default -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default">顶部</button>
                        <button type="button" class="btn btn-default">中间</button>
                        <button type="button" class="btn btn-default">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-default"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-default btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-default">1</button>
                        <button type="button" class="btn btn-default">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- ./default -->
                  <!-- Info -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info">顶部</button>
                        <button type="button" class="btn btn-info">中间</button>
                        <button type="button" class="btn btn-info">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-info btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-info">1</button>
                        <button type="button" class="btn btn-info">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /. info -->
                  <!-- /.danger -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger">顶部</button>
                        <button type="button" class="btn btn-danger">中间</button>
                        <button type="button" class="btn btn-danger">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-danger"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-danger btn-flat"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-danger">1</button>
                        <button type="button" class="btn btn-danger">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.danger -->
                  <!-- warning -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning">顶部</button>
                        <button type="button" class="btn btn-warning">中间</button>
                        <button type="button" class="btn btn-warning">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-warning"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-warning btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-warning">1</button>
                        <button type="button" class="btn btn-warning">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-warning dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.warning -->
                  <!-- success -->
                  <tr>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success">顶部</button>
                        <button type="button" class="btn btn-success">中间</button>
                        <button type="button" class="btn btn-success">底部</button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-center"></i></button>
                        <button type="button" class="btn btn-success"><i class="fas fa-align-right"></i></button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-left"></i></button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-center"></i>
                        </button>
                        <button type="button" class="btn btn-success btn-flat"><i class="fas fa-align-right"></i>
                        </button>
                      </div>
                    </td>
                    <td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success">1</button>
                        <button type="button" class="btn btn-success">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                            <li><a class="dropdown-item" href="#">下拉链接</a></li>
                          </ul>
                        </div>
                      </div>
                    </td>
                  </tr>
                  <!-- /.success -->
                </table>
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->

            <!-- Radio Buttons -->
            <div class="card">
              <div class="card-header">
                <h3 class="card-title">单选按钮组</h3>
              </div>
              <div class="card-body table-responsive pad">
                <p class="mb-1">单选按钮组使用 <code>.btn-secondary</code></p>
                <div class="btn-group btn-group-toggle" data-toggle="buttons">
                  <label class="btn btn-secondary active">
                    <input type="radio" name="options" id="option1" autocomplete="off" checked> 选中
                  </label>
                  <label class="btn btn-secondary">
                    <input type="radio" name="options" id="option2" autocomplete="off"> 单选
                  </label>
                  <label class="btn btn-secondary">
                    <input type="radio" name="options" id="option3" autocomplete="off"> 单选
                  </label>
                </div>

                <p class="mt-3 mb-1">单选按钮组使用 <code>.bg-olive</code></p>
                <div class="btn-group btn-group-toggle" data-toggle="buttons">
                  <label class="btn bg-olive active">
                    <input type="radio" name="options" id="option1" autocomplete="off" checked> 选中
                  </label>
                  <label class="btn bg-olive">
                    <input type="radio" name="options" id="option2" autocomplete="off"> 单选
                  </label>
                  <label class="btn bg-olive">
                    <input type="radio" name="options" id="option3" autocomplete="off"> 单选
                  </label>
                </div>
              </div>
              <!-- /.card-body -->
            </div>
            <!-- /.card -->
          </div>
          <!-- /.col -->
        </div>
        <!-- /. row -->